| 摘要 |
PURPOSE:To expand the shape of an annular explosion-proof band in similar form even when the band is heated and insert a cathode-ray tube while the central axis of the cathode-ray tube is matching that of the band by heating the band while it is being pulled outside through support metal fittings. CONSTITUTION:An annular explosion-proof band 6 is formed by making both ends of belt-shaped soft steel, stainless steel or the like annulated by welding or making a soft steel sheet, stainless steel sheet or the like annulated by punching. Said annular explosion-proof band 6 that fits support metal fittings 5 on four corners by welding or the like and a cathode-ray tube are mounted on the respective jigs so that the central axes of both the band and cathode-ray tube can coincide with each other. After the annular band 6 is heated at for example 500 deg.C, and the cathode-ray tube is inserted promptly, the cathode-ray tube is tightened by cooling the explosion-proof band 6 and shrinking the band. As a result, even when the explosion-proof band is heated, its shape can be expanded in similar form and the cathode-ray tube can be inserted while the central axis of the cathode-ray tube coincides with that of the band. |
